import { Span } from "../diagnostics.ts";

export type Token = TokenData & {
    span: Span;
    length: number;
};

export type TokenData =
    | { type: "ident"; identValue: string }
    | { type: "int"; intValue: number }
    | { type: "string"; stringValue: string }
    | { type: string };

export interface TokenIter {
    next(): Token | null;
}

export class SigFilter implements TokenIter {
    public constructor(private iter: TokenIter) {}

    next(): Token | null {
        const token = this.iter.next();
        if (token === null) {
            return token;
        }
        if (token?.type === "whitespace" || token?.type === "comment") {
            return this.next();
        }
        return token;
    }
}